His sister isn't good at sing 哪里错了

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查看11 | 回复4 | 2012-3-13 21:00:03 | 显示全部楼层 |阅读模式
His sister isn't good at singinggoodat+doing...
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千问 | 2012-3-13 21:00:03 | 显示全部楼层
His sister isn't good at singing...
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千问 | 2012-3-13 21:00:03 | 显示全部楼层
be good at +doingHis sister isn't good at singing....
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千问 | 2012-3-13 21:00:03 | 显示全部楼层
sing改为singing...
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